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Conference on CCME ISR 2821

Hi All,

I'm a problem using conference with calls between an internal 7931 IP Phone and two external GSM Phone.

To call gsm phones I use an IP GSM gateway (Quescom) with four simultaneous channels (4 GSM SIM)

Normally I haven't any problems when 1, 2, 3 or 4 users call external consumers using GSM gateway.

Now, if I try to start a conference: first call to outgoing user on GSM (for example: 03381234567), next press CONF on IPPhone display, next I try to digit

second GSM phone number, but on phone display appears "impossible to complete conference".

Note: for emergency calls on GSM numbers, (GSM gateway out of service or bad signal cell, etc), I have attivated to force outgoing calls on GSM numbers,

a numbers sequence to digit before to digit GSM number = 0 + 9 + GSM phone number. This mode enable user to call a GSM number using ISDN channels.

Using this method the conference between two external numbers and one internal works correctly, as between tree internal numbers too.

In attach the configuration on the router ISR 2821.

Please could you help me to solve this problem?

Thank you for best support

Kind Regards

Tonino

!

voice call send-alert

voice call convert-discpi-to-prog

voice call carrier capacity active

voice rtp send-recv

!

voice service pots

!

voice service voip

allow-connections h323 to h323

no supplementary-service h450.2

no supplementary-service h450.3

h323

!

voice class codec 10

codec preference 10 g711ulaw

codec preference 13 g711alaw

codec preference 14 g729r8

!

voice class h323 1

h225 timeout tcp establish 3

!

telephony-service

load 7931 SCCP31.8-2-2SR1S

max-ephones 58

max-dn 192

ip source-address 10.70.11.11 port 2000

timeouts interdigit 7

system message COMPANY

url directories http://10.70.10.30/fw/apps/speedy/xml/directory.asp

url authentication http://10.70.10.30/fw/authenticate.asp

user-locale IT

network-locale IT

time-zone 23

time-format 24

date-format dd-mm-yy

voicemail 9999

max-conferences 8 gain -6

call-forward pattern .T

moh music-on-hold.au

transfer-system full-consult dss

transfer-pattern .T

transfer-pattern 0T

secondary-dialtone 0

xmltest

create cnf-files version-stamp 7960 Dec 13 2008 17:03:31

!

dial-peer voice 50 voip

corlist outgoing GSM CALL

description ** DIAL PEER CALL TO GSM GATEWAY **

translation-profile outgoing OUT-GSM-GW

preference 1

max-conn 4

destination-pattern 03T

voice-class codec 10

session target ipv4:10.70.11.12

dtmf-relay h245-alphanumeric

no vad

!

dial-peer voice 70 pots

corlist outgoing CALL-CELLULARI

description *** OUTGOING FORCED CALLS CELLULARI TO ISDN***

preference 1

destination-pattern 093T

progress_ind alert enable 8

progress_ind progress enable 8

progress_ind connect enable 8

translate-outgoing calling 1

direct-inward-dial

port 0/0/0

prefix 3

!

dial-peer voice 71 pots

corlist outgoing CALL-CELLULARI

description *** OUTGOING FORCED CALLS CELLULARI TO ISDN***

preference 2

destination-pattern 093T

progress_ind alert enable 8

progress_ind progress enable 8

progress_ind connect enable 8

translate-outgoing calling 1

direct-inward-dial

port 0/0/1

prefix 3

!

dial-peer voice 72 pots

corlist outgoing CALL-CELLULARI

description *** OUTGOING FORCED CALLS CELLULARI TO ISDN***

preference 3

destination-pattern 093T

progress_ind alert enable 8

progress_ind progress enable 8

progress_ind connect enable 8

translate-outgoing calling 1

direct-inward-dial

port 0/1/0

prefix 3

!

dial-peer voice 73 pots

corlist outgoing CALL-CELLULARI

description *** OUTGOING FORCED CALLS CELLULARI TO ISDN***

preference 4

destination-pattern 093T

progress_ind alert enable 8

progress_ind progress enable 8

progress_ind connect enable 8

translate-outgoing calling 1

direct-inward-dial

port 0/1/1

prefix 3

!

1 REPLY
Silver

Re: Conference on CCME ISR 2821

This could indicate a codec mismatch exists between IP phones used for conferencing.

Do one of the following:

Use the same codecs on phones used for conferencing, and make sure that all of the regions and conference bridges use the same codec. Use hardware conference bridges which can perform transcoding.

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